I was talking to a trucker(brother inlaw) and he said that his kenworth has about 3inchs of insulation inside the hood and some on the firewall , this helps a to keep the noise down. I have a t444e, dognose, Im thinking of doing something like that to our bus, anything to help the noise.. any one tryed this? what are your thoughts on this? or is this a waisof time?

I was wondering also about the heat? I dont really know , I would think that the air flow would still be there, it really shouldnt have to much effect on it, but im not sure, will have to wait and see what the other skoolies say.
also, what would be the best to use for insulating the hood?

on a other note, Im just getting back to doing some work on our bus, took a bit a brake, used it for camping!! what a blast, was good to do it figured out a lot of things , like where to but lights, furnace, where you need outlets etc.

Now that I'm thinking about it ... It looks like the hood that I've got has 'air channels' that divert the air, then channels it back into the air filter before it hits the engine. Does the heated air make a difference to the performance of the engine, and then will the insulation make a difference to making those 'channels' cooler?

hey Hex, on a diesel engine manufacturers try for an intake temp of 100 F for optimine performance. Insulating the hood should not affect the intake air temp negatively. Remember operator comfort helps decrease fatigue when driving long distances so any noise/heat reduction you can do will help out on those long drives, this also gives us a reason to get a really comofy seat for the driver I mean how can she argue with "but honey its for your safety" . Good luck